天然气加湿富氧燃烧特性分析及烟气置换NGH方案  

Analysis of Natural Gas Oxy-Fuel Humidified Combustion Characteristics and Scheme of Replacement of NGH with Flue Gas

作　　者：任昕 张引弟[1,2] 刘畅 朱秋格[3] Ren Xin;Zhang Yindi;Liu Chang;Zhu Qiuge(College of Petroleum Engineering,Yangtze University,Wuhan 430100,China;Measurement Science and Standards,National Research Council of Canada,Ottawa K1AOR6,Canada;Beijing Branch,China Petroleum Engineering&Construction Corporation,Beijing 100085,China)

机构地区：[1]长江大学石油工程学院,武汉430100 [2]加拿大国家研究院测量科学与标准研究中心,加拿大渥太华K1AOR6 [3]中国石油工程建设有限公司北京设计分公司,北京100085

出　　处：《燃烧科学与技术》2020年第2期176-184,共9页Journal of Combustion Science and Technology

基　　金：国家留学基金资助项目(201708420106);中国石油科技创新基金资助项目(2015D-5006-0603);国家自然科学基金资助项目(51306022);长江青年科技创新团队基金资助项目(2015cqt01)。

摘　　要：天然气工业锅炉的污染物排放标准日趋严格,采用单一的控制污染物排放技术手段已难以满足现有需求.本文以提高燃烧热效率与控制污染物排放量为目标,基于富氧燃烧、加湿燃烧与低氮燃烧的组合技术路线,提出一套天然气富氧加湿燃烧及烟气置换开采天然气水合物(NGH)方案.对天然气预混水蒸气燃烧进行数值模拟,确立最佳水蒸气预混比为Rf=0.33.在此基础上,分析不同烟气再循环率及过量空气系数对天然气加湿燃烧特性及污染物排放特性的影响规律以得出最优工况.该工况经烟气循环一次后,直接置换开采NGH的能源投资回报值(EROI)为7.5,具有实际开采价值.With the increasingly strict pollutant emission standards of natural gas industrial boilers,it is difficult to meet the existing demand by adopting one single technology to control pollutant emissions.In order to improve the combustion thermal efficiency and control pollutant emissions,this paper proposes a co-production scheme of natural gas oxy-fuel humidified combustion and replacement of natural gas hydrate(NGH)with flue gas based on the combined technical route of oxy-fuel combustion,humidified combustion and low NOx combustion.Through the numerical simulation of natural gas premixed steam combustion,the optimum steam premixed ratio is determined to be Rf=0.33.On this basis,the effects of different flue gas recirculation ratios and excess air coefficients on natural gas humidified combustion characteristics and pollutant emission characteristics are analyzed to obtain the optimal working conditions.After one flue gas recirculation,the energy return on investment(EROI)of direct replacement mining NGH is 7.5,meaning it has an actual exploitation value.

关 键 词：天然气 富氧燃烧 注蒸气 烟气再循环率 过量空气系数 

分 类 号：TK16[动力工程及工程热物理—热能工程]